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John Goff, 17, allegedly stabbed Marcum multiple times Thursday at about 11:15 p.m. Thursday on a bike path near Palm Street in Nashua, New Hampshire.

Nashua police officers say they later found the 49-year-old victim lying on the ground. He was taken to the hospital, where he later died.

Rodger Roy was one of Marcum's neighbors, and knew him well.

"When I heard about it, I said he doesn't deserve this," Roy said.

Marcum's neighbors have set up a memorial with candles, flowers, and a balloon inside his former apartment building.

Investigators are still trying to determine what led to the stabbing. They say Marcum and Goff didn't know each other.

"It looks like an instance where these two individuals met through circumstances that we're still trying to get a handle on," said Senior Assistant Attorney General Benjamin Agati.

The Attorney General's Office says the investigation will continue through next week.

"We've learned that there were several different people who were out and about that night. We're hoping that there are more," Agati said.

Marcum's brother says Benjamin had schizophrenia and had a hard time dealing with the recent deaths of two of his other brothers.

In a statement, the family said, "We all know Ben as a warm, comfortable guy. He took great pride in his family name and spent much time with us. From what I understand, Ben put up one hell of a fight, unfortunately, he didn't win it."

Marcum's neighbors are wondering why this happened. They say the arrest is somewhat comforting.

"I'm glad they found someone," Roy said.

Goff is expected to be arraigned at 8:15 a.m. Monday.

Anyone with information about the stabbing can contact the Nashua Police Department at 603-594-3500.